Rolling-mill for the manufacture of pipes and other hollow bodies.



No. 894,140. 'PATENTED JULY 21, 1908.

O. HEER. ROLLING MILL FOR THE MANUFACTURE OF PIPES AND OTHER 7 HOLLOW BODIES. APPLIOATION FILED 8EPT'.B,1905.

14am; MW 55% 0C. @m.

No. 894,140; PATENTED JULY 21, 1908. 0. HBBR.

ROLLING MILL FOR THE MANUFACTURE OF PIPES AND OTHER HOLLOW BODIES.

APPLICATION ,IILED SEPT.28.1905.

2 SHEETS-SHEET 2.

Fig: 3.

lng

W; @mm

' Manufacture of Pipes and other Hollow.

UNITED STATES PATENT OFFICE.

OTTO .HEER, OF ZURICH, SWITZERLAND.

ROLLING-MILL FOR THE MANUFACTURE OF PIPES AND OTHER HOLLOW BODIES.

Noi'894, 14o.

Specification of Letters Patent.

Patented my 21, 1908.

Application filed September 28, 1905. Serial No. 280,533,

To all whom it may concern: 7

Be it knownthat I, OTTO HEER, a citizen of iZhe Swiss Confederation, and resident of Zurich, Switzerland, have invented new and useful Improvements in Rolling-Mills for the tron.

This invention Bodies, of. which the following is a specifica has for its object a device for rolling-mills. for manufacturingpipes' and other hollow bodies, fintendedxto; give tot'he work-pieces on-.'the core-bar, .Whicharelto' be stretched, piece by piece, by means of two.

grooved rollers -.journaled in a stationary franie the niotionreqnired for this kind of rollingfth'atis .to'say a to and fro motion;- in

' which the advance is greater thanithe retro gress'ion'; 'From the constructions now in us'e for-producing this kind of motion the present inventiondiifers, in the main, in that respect that'lat the end ofithe advance mo tion,.in' addition to the avoidance offshpcks,

the temporaryffii ring ofthework-p iece is jef-z fe'c'te'd', .inro'rder-"to; prevent the troublesome manner into the position requiredfor removingmhe rolled P pe and'for puttingo-n a worIi-pieca r 011' the accompanying such -ade: vice-is illustrated on Sheet I and in Figure 1- in a side-view and partly in a longitudinal sectionfand iigIFig. 2 in a longitudinal section, on Sheet section ontheline'y'y; I

Similar letters referto similar parts throughout the several views.

' retrogression, is provided on its hind part with a thread and a longitudinal groove and screwed into a nut e rigidly journaled in the middle of.;a cross piece f; the ends of this cross-piece, which form eyes or hooks, are iixed on two bars g, each of which is carried intermediate shaft by two blocks i and k, sliding lengthwise between guide-rails n, W, and of which the responding bars g, while the hind blocks can be shifted along the same. Both blocks, on

each side, are united by means of a resilient front-blocks 'i' are rigidly united with the cor-- strutconsisting of two pairs of links Z andl" nected with the same by'a bar g is arranged a wedge-shaped block h'guided by the lower rail n of the slide. The end .of this slide which rests on-the roller-frame '0 forms a f shoe, that is to say a casing openin front and at'the back. In this casingis provided a cover-plate, whichcan be shifted in an 11 ward'directionat a right anglewith the sli c Q recoiling ofithe piece, which occurso at the s and within certain limits, which plate is constantly held by two spiral springs 1, arranged below the cover of the shoe, ilowest position.

In front of the nut-e, and on thesame axis, a toothed wheel '0, which'cambe rotated but not be shifted, has been arranged n-the crosspiece f whose central boreenconipasscs the rod 1) of the corebar and receives a wedge which engages the longitudinal groove on the threadedpart of this-bar. This toothed wheel a constantly engages with a long toothed drum 8 arranged between the two slides of the blocks 01, 7c, and which is turned by a special motor 25, but can, when this 1notor has been uncoupled,'be nioved-by-successive starts by the intermediate shaft "l1- riinning parallel with it,.by .means of a de- I f tent o provided with :apawl oand actuated I in Fig. 3 in a horizontal sec- 'tion on the line as m, a'nd'in' Fig. 4- in' a crossby an eccentric u and its rod. 7 V This device works as follows :4 The core-bar 1);. after receiving the work-piece'a, is rotated by the motor t, and thereby screwed out of thenut e and advanced until the front-end of the work-piece has passed through grooves in the caliber of the working-rollers and is' thus between the same. When after the uncoupling of the motor these; rollers are then rotated the work iece, which is then stretched by these roilers, is, \IIIdGIj'thEiLSLC- is forced, after its temporary release, which 'tion, pushed back a certain distance untiljit takes place at the moment the caliber grooves close together over the rolled part,

by the cross-piece f, advanced attln's moment by the crank shaft w, to partici ate in the forward movement of the same. uring this advance a temporary rotation -of the drum 8 and of the Wheel 0 is produced in consequence of' the forward swinging of the pawl 41 caused at the same time by the eccentric disk a and thereby is effected, in addition to a rotation of the bar I), to the extent of 90, the forward screwing of the same a distance equal to the difference between the advances and the retrogressions of the work-piece.

Shortly after the termination of the ad' vance of the work-piece the wedge-shaped blocks h, which were forced to participate in this movement, enter into the shoes at the end of their slide, whose cover-plates q they press upwards, against'the action of the spiral springs 1", until these plates touch the up per surface of the space in which they move. Hereby the plates, and at the same time the blocks h, are secured and held in this temporary position, and through the rod w still "advances, the cross-piece f and the core-bar b with thework-piece a. stand still until the calibers of the working-rollers, which at this moment close together cause the retrogfession of the said parts and thereby also of the blocks h and their .release from the shoes. This retrogression is effected, without the cooperation of the crank shaft to, solely by the action of the rotating working-rollers upon the work-piece, While the still greater ad- Vance-movement of this iece is only caused by the shaft acting on t e cross-piece f and by the forward-screwing of the core-bar b, which takes place at the same time.

In order to revent a disturbing action of the crank shaft on the cr0sspiece and the parts rigidly united with it, during the retro-' "gression of the same, caused bythe workingrollers, struts have been-provided between the blocks 7'. and k which moreover havethe object to allow of thefurther advance'of the cranks of the shaft, until they-reach their dead point, after the wedge-shaped blocks h have already been secured-before this happens. -By the bending of their links Z Z thesestrutsallow of the variations in the distance whileunder. the action of their springs 'm -the distance "between. the blocks, after each f change, is always reduced again to the normal bounds.

What I claim as my invention and desire to .secure by: United States'Letters Patent 1. In a tube rolling mill the combination ofa' stationary frame, a pair of rollers at one end thereof, a core bar, a pair of movable rods carrying the bar, a pair of blocks con: nected with each rod, one block of each pair having yielding movement in relation to its rod while the other block of the pair is firmly connected to its rod, resilient means connecting the blocks of each pair and actuating means connected to the movable blocks.

2. In a tube rolling mill the combination of a stationary frame, a pair of rollers at one end thereof, a core bar, a sliding block having rigid connection with said bar, a second sliding block connected with said. bar but having movement relative thereto, a resilient" strutconnecting the two blocks and actuating means connected to the movable block.

3. In rolling mills-for drawing out pipes,

two rollers and means for advancing the work piece between the rollers, a cross piece carrylng said core bar, a air of rods support-' ing the cross piece, a sli 'ng block supported and guided on the frame and supporting each end of each rod, the blocks at one end of the rods having sliding movement thereon, a resilient strut connecting the blocks of each pair to ether, said strut consisting of two pairs 0 angle links and a spiral spring lo-' cated between the inner ends thereof and .means for reciprocating the rearmost blocks.

In testimony whereof I have signed .my name to this specification in the twosubscribing.witnesses.

l OTTQ'HEER. Witnesses: 1

A. LIEBERKNEOHT,

' G. A. Wrcermrnv.

presence of 

